"Electromagnetic Waves" by R.K. Shevgaonkar is a foundational 2005 textbook for undergraduate engineering, noted for its systematic approach to high-frequency electromagnetics. The text covers transmission lines, Maxwell’s equations, and wave propagation through a linear system modeling lens, often complemented by NPTEL lectures. For access to the material, explore resources such as NPTEL courses Centre for Systems and Control Electromagnetic Waves and Optics, a Linear System Approach